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An object is seen through a simple microscope of focal length 12cm. The angular magnification produced if the image is formed at the near point of the eye which is 25cm away from it is?

Option: 1

3.1


Option: 2

2.4


Option: 3

2.7


Option: 4

3.4


Answers (1)

As we learn

Simple Microscope -

m= \frac{D}{u_{o}}
 

- wherein

D=  Distance for clear vision

u_{o}= Distance of object when image from at D.

m= \frac{D}{f} when object is at infinity

m=1+ \frac{D}{f} when magnification is maximum.

 

 The angular magnification produced by a simple microscope when the image is formed at the near point of eye is given as

m=1+\frac{D}{f}                here   f=12cm and D=25cm

Hence

m=1+\frac{25}{12}=3.10

                                                     

 

Posted by

Sumit Saini

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